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AM3359 A8 ,,WFI'' instruction won't cause IRQ on M3

Balazs Ancsa
Prodigy 95 points
Other Parts Discussed in Thread: AM3359

Hi!

I'm using a custom board with AM3359 CPU on it and I would like to try the low power modes.
I'm using the StarterWare library.

So I have written code for the Cortex-A8 inside the AM3359 which uploads the code of the Cortex-M3 inside the AM3359 and starts it, than wait for a synchronization and then execute a ,,WFI'' instruction. On the other side the Cortex-M3 waits for the IRQ-34 (PRCM_M3_IRQ2 PRCM - irq_mpuisgated_wkup_m3, Reference Manual page 526) after the synchronization event.

This IRQ never occurred.

If the A8 gets an IRQ after the WFI and wakes up, than the M3 gets the IRQ-48 (MPU_WAKE MPU subsystem - POMWAKEUP, Reference Manual page 527).

What settings needs to be done before executing the WFI to get an IRQ on the M3 as described in the Reference Manual page 984-985?

Best Regards,
Balazs